Title: Legacy Outlook for Mac users may be unable to connect to their Exchange Online mailboxes
User impact: Users may have been unable to connect to their Exchange Online mailboxes through Outlook for Mac.
Final status: We’ve confirmed that our fix has completed its deployment to the affected environment. Additionally, by verifying with affected users and monitoring the service, we’ve verified that the problem has been successfully resolved.
Scope of impact: Users on the legacy Outlook for Mac client who attempted to access their Exchange Online mailboxes may have been impacted.
Start time: Friday, March 15, 2024, at 8:00 AM UTC
End time: Wednesday, April 3, 2024, at 4:00 PM UTC
Root cause: A recent service maintenance change introduced a code issue that inhibited communication between legacy Outlook for Mac users and the Exchange Online service, which resulted in the impact.
Next steps:
– We’re investigating how the recent service maintenance change introduced the code issue that inhibited communication between legacy Outlook for Mac users and the Exchange Online service to prevent this problem from happening again in the future.
This is the final update for the event.
